They provide a simple way of tracking anything on the web, from product prices to insider trading, medical research to crime in your neighborhood, or hip-hop albums on iTunes to apartment listings on craigslist.

Welcome to HEYCRAIG, the simplest way to find the stuff you want on craigslist. Give us a keyword, an email and a location. We'll email you when stuff you want is available. It's seriously that simple.

Tracking topics on the Web can be a painful process, due to the amount of noise and difficulty of filtering it. So to help you out, we've selected and categorized the leading topic-tracking tools. This is based on the discussion that arose from our earlier post about topic feeds, which are RSS feeds for keywords or phrases.
During the process of analyzing these topic tracking tools, we discovered - to our surprise - that not many of these services output results as RSS. Some of the leading apps in this field require users to visit their service. With that in mind, here is our full list and analysis.

Tracking topics on the Web can be a painful process, due to the amount of noise and difficulty of filtering it. So to help you out, we've selected and categorized the leading topic-tracking tools. This is based on the discussion that arose from our earlier post about topic feeds, which are RSS feeds for keywords or phrases.
During the process of analyzing these topic tracking tools, we discovered - to our surprise - that not many of these services output results as RSS. Some of the leading apps in this field require users to visit their service. With that in mind, here is our full list and analysis.